feat(i18n): routing and localization infrastructure (phase 1)

Implement Phase 1 of i18n spec:
- Configure next-intl with 6 locales (pt, en, es, fr, de, zh-CN) and pathnames
- Move routes to app/[locale] structure with localized layouts and metadata
- Add middleware for root language negotiation (307), legacy redirects (308), and 404 for non-pt book
- Implement language selector dropdown in header with cookie persistence
- Add system typography rules for zh-CN and word-break/hyphenation for de/fr

Co-Authored-By: Antigravity <noreply@google.com>

app/[locale]/frameworks/layout.jsx

@@ -0,0 +1,39 @@
+import { paginaMeta, jsonLd } from "@/lib/seo";
+
+export const metadata = paginaMeta({
+	titulo: "Frameworks & SDKs para ESP32: Guia Completo e Comparativo",
+	descricao: "Guia completo de desenvolvimento: ESP-IDF, ESP-RainMaker, ESP-Matter, Rust, ESP-ADF, ESP-SR, ESP-WHO, Arduino e MicroPython com exemplos de código.",
+	caminho: "/frameworks",
+	keywords: [
+		"ESP-IDF",
+		"ESP-RainMaker",
+		"ESP-Matter",
+		"Rust ESP32",
+		"ESP-SR",
+		"ESP-ADF",
+		"ESP-IoT-Solution",
+		"Arduino ESP32",
+		"MicroPython ESP32",
+		"frameworks ESP32",
+		"programar ESP32",
+	],
+});
+
+export default function FrameworksLayout({ children }) {
+	return (
+		<>
+			<script
+				type="application/ld+json"
+				dangerouslySetInnerHTML={{
+					__html: JSON.stringify(
+						jsonLd.trilha([
+							{ nome: "Início", caminho: "/" },
+							{ nome: "Frameworks", caminho: "/frameworks" },
+						])
+					),
+				}}
+			/>
+			{children}
+		</>
+	);
+}